CVE-2022-22172: 2022-01 Security Bulletin: Junos OS and Junos OS Evolved: An l2cpd memory leak can occur when specific LLDP packets are received leading to a DoS (CVE-2022-22172)

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2022-01 Security Bulletin: Junos OS and Junos OS Evolved: An l2cpd memory leak can occur when specific LLDP packets are received leading to a DoS (CVE-2022-22172)

Article ID: JSA11278 SECURITY_ADVISORIES Last Updated: 12 Jan 2022Version: 1.0 Product Affected:

This issue affects Junos OS 18.4, 19.2, 19.3, 19.4, 20.1, 20.2, 20.3, 20.4, 21.1, 21.2. This issue affects all versions of Junos OS Evolved.

Problem:

A Missing Release of Memory after Effective Lifetime vulnerability in the Layer-2 control protocols daemon (l2cpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker to cause a memory leak. Continued exploitation can lead to memory exhaustion and thereby a Denial of Service (DoS).

This issue occurs when specific LLDP packets are received. The impact of the l2cpd cores is that if any of the stp protocols (rstp, mstp or vstp) is used then stp re-converges and traffic loss will occur during that time. Also if any services depend on LLDP state (like PoE or VoIP device recognition) then these will also be affected.

The memory utilization of the L2CPd process can be monitored with the following command:

user@host> show system processes extensive | match l2cpd

1234 root 52 0 521M 43412K RUN 1 4:02 34.47% l2cpd

This issue affects Juniper Networks Junos OS:

• 18.4 version 18.4R2-S4 and later versions prior to 18.4R2-S10.
• 19.2 versions prior to 19.2R1-S8, 19.2R3-S4;
• 19.3 versions prior to 19.3R3-S5;
• 19.4 versions prior to 19.4R3-S7;
• 20.1 versions prior to 20.1R3-S3;
• 20.2 versions prior to 20.2R3-S2;
• 20.3 versions prior to 20.3R3-S1;
• 20.4 versions prior to 20.4R3;
• 21.1 versions prior to 21.1R2-S2, 21.1R3;
• 21.2 versions prior to 21.2R2;

Juniper Networks Junos OS Evolved

• All versions prior to 20.4R3-S2-EVO;
• 21.1 version 21.1R1-EVO and later versions;
• 21.2 versions prior to 21.2R2-EVO.

This issue does not affect Juniper Networks Junos OS 19.1 version 19.1R1 and later versions.

This vulnerability is only exploitable on interfaces with LLDP enabled.

[ protocols lldp ]

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue was seen during production usage.

This issue has been assigned CVE-2022-22172.

Solution:

SOLUTION:

The following software releases have been updated to resolve this specific issue:

for Junos OS: 19.2R1-S8, 19.2R3-S4, 19.3R3-S5, 19.4R3-S7, 20.1R3-S3, 20.2R3-S2, 20.3R3-S1, 20.4R3, 21.1R2-S2, 21.1R3, 21.2R2, 21.3R1, and all subsequent releases.

for Junos OS Evolved: 20.4R3-S2-EVO, 21.2R2-EVO, 21.3R1-EVO, and all subsequent releases.

This issue is being tracked as 1602588.

Workaround:

There are no viable workarounds for this issue.

Implementation:

Software releases or updates are available for download at https://support.juniper.net/support/downloads/

Modification History:

2022-01-12: Initial Publication.

CVSS Score:

6.5 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Severity Level:

Medium

Severity Assessment:

Information for how Juniper Networks uses CVSS can be found at KB 16446 “Common Vulnerability Scoring System (CVSS) and Juniper’s Security Advisories.”

Related Links

• KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin Publication Process
• KB16765: In which releases are vulnerabilities fixed?
• KB16446: Common Vulnerability Scoring System (CVSS) and Juniper’s Security Advisories
• Report a Security Vulnerability - How to Contact the Juniper Networks Security Incident Response Team
• CVE-2022-22172 at cve.org

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